<template>
  <div class="cart-box">
    <s-header :name="'购物车'"></s-header>
    <div class="cart-body">
      <van-checkbox-group @change="groupChange" v-model="result" ref="checkboxGroup">
        <van-swipe-cell :right-width="50" v-for="(item, index) in list" :key="index">
          <div class="good-item">
            <van-checkbox :name="item.cartItemId" />
            <div class="good-img"><img :src="prefix(item.goodsCoverImg)" alt=""></div>
            <div class="good-desc">
              <div class="good-title">
                <span>{{ item.goodsName }}</span>
                <span>x{{ item.goodsCount }}</span>
              </div>
              <div class="good-btn">
                <div class="price">¥{{ item.sellingPrice }}</div>
                <van-stepper
                  integer
                  :min="1"
                  :value="item.goodsCount"
                  :name="item.cartItemId"
                  async-change
                  @change="onChange"
                />
              </div>
            </div>
          </div>
          <van-button
            slot="right"
            square
            icon="delete"
            type="danger"
            class="delete-button"
            @click="deleteGood(item.cartItemId)"
          />
        </van-swipe-cell>
      </van-checkbox-group>
    </div>
    <van-submit-bar
      v-if="list.length > 0"
      class="submit-all"
      :price="total * 100"
      button-text="结算"
      @submit="onSubmit"
    >
      <van-checkbox @click="allCheck" v-model="checkAll">全选</van-checkbox>
    </van-submit-bar>
    <div class="empty" v-if="!list.length">
      <van-icon name="smile-o" />
      <div class="title">购物车空空空如也</div>
      <van-button color="#1baeae" type="primary" @click="goTo" block>前往首页</van-button>
    </div>
    <nav-bar></nav-bar>
  </div>
</template>

<script>
import { Toast } from 'vant'
import navBar from '@/components/NavBar'
import sHeader from '@/components/SimpleHeader'
import { getCart, deleteCartItem, modifyCart } from '../service/cart'
export default {    
    data() {
        return {
            checked:false,
            list:[],
            all:false,
            result:[],
            checkAll:true
        }
    },
    components:{
        navBar,
        sHeader
    },
    mounted() {
        this.init()
    },
    computed:{
        total:function(){
            let sum = 0;
            let _list = this.list.filter(item=> this.result.includes(item.cartItemId))
            _list.forEach(item=>{
                sum += item.goodsCount * item.sellingPrice
            })
            return sum
        }
    },
    methods: {
        async init(){
            Toast:loading({message:'加载中...', forbidClick:true});
            const { data } = await getCart({ pageNumber: 1})
            this.list = data
            this.result = data.map(item=> item.cartItemId)
            Toast.clear()
        },
        goBack(){
            this.$router.go(-1)
        },
        goTo(){
            this.$router.push({path:'home'})
        },
        async onChange(value,detail){
            if(this.list.filter(item=>item.cartItemId == detail.name)[0].goodsCount == value) return
            Toast.loading({ message: '修改中...',forbidClick:true});
            const params = {
                cartItemId: detail.name,
                goodsCount:value
            }
            const { data } = await modifyCart(params)
            this.list.forEach(item=>{
                if(item.cartItemId == detail.name){
                    item.goodsCount = value
                }
            })
            Toast.clear()
        },
        async onSubmit(){
            if(this.result.length == 0){
                Toast.fail('请选择商品进行结算')
                return
            }
            const params = JSON.stringify(this.result)
            this.$router.push({path:`create-order?cartItemIds=${params}`})
        },
        async deleteGood(id){
            const { data } = await deleteCartItem(id)
            this.$store.dispatch('updateCart')
            this.init()
        },
        groupChange(result){
            if(result.length == this.list.length){
                this.checkAll = true
            }else{
                this.checkAll = false
            }
            this.result = result
        },
        allCheck(value){
            if(!this.checkAll){
                this.result = this.list.map(item=> item.cartItemId)
            }else{
                this.result = []
            }
        }
    },
}
</script>
<style lang="less">
  @import '../common/style/mixin';
  .cart-box {
    .cart-header {
      position: fixed;
      top: 0;
      left: 0;
      z-index: 10000;
      .fj();
      .wh(100%, 44px);
      line-height: 44px;
      padding: 0 10px;
      .boxSizing();
      color: #252525;
      background: #fff;
      border-bottom: 1px solid #dcdcdc;
      .cart-name {
        font-size: 14px;
      }
    }
    .cart-body {
      margin: 60px 0 100px 0;
      padding-left: 10px;
      .good-item {
        display: flex;
        .good-img {
          img {
            .wh(100px, 100px)
          }
        }
        .good-desc {
          display: flex;
          flex-direction: column;
          justify-content: space-between;
          flex: 1;
          padding: 20px;
          .good-title {
            display: flex;
            justify-content: space-between;
          }
          .good-btn {
            display: flex;
            justify-content: space-between;
            .price {
              font-size: 16px;
              color: red;
              line-height: 28px;
            }
            .van-icon-delete {
              font-size: 20px;
              margin-top: 4px;
            }
          }
        }
      }
      .delete-button {
        width: 50px;
        height: 100%;
      }
    }
    .empty {
      width: 50%;
      margin: 0 auto;
      text-align: center;
      margin-top: 200px;
      .van-icon-smile-o {
        font-size: 50px;
      }
      .title {
        font-size: 16px;
        margin-bottom: 20px;
      }
    }
    .submit-all {
      margin-bottom: 50px;
      .van-checkbox {
        margin-left: 10px
      }
      .van-submit-bar__text {
        margin-right: 10px
      }
      .van-submit-bar__button {
        background: @primary;
      }
    }
    .van-checkbox__icon--checked .van-icon {
      background-color: @primary;
      border-color: @primary;
    }
  }
</style>
